export function isEmpty(v) {
  switch (typeof v) {
    case "undefined":
      return true
    case "string":
      if (v.replace(/(^[ \t\n\r]*)|([ \t\n\r]*$)/g, "").length === 0)
        return true
      break
    case "boolean":
      if (!v) return true
      break
    case "number":
      if (v === 0 || isNaN(v)) return true
      break
    case "object":
      if (v === null || v.length === 0) return true
      break
    default:
      return false
  }
}
